If we decide to do this, the `"3_month"` string will change to
`"6_month"`, and the object will contain twice as many values. We should
make sure that Relay Search can handle this before we make this change.
Requires a minor protocol version change.
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25175>
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The Tor Project: anonymity online